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大概思路:将参数组装为一个map集合,签名后发送http请求给微信,微信会返回一个xml字符串,将这个xml字符串解析并验签,得到code_url参数,传给前台,前台将这个code_url生成一个二维码,就可以了。
1、创建支付
/** * 微信支付 * @param model * @param order_id * @return * @throws Exception */ @RequestMapping(value = "/doWechatPay", method = RequestMethod.POST) @ResponseBody public Map createWechatPay(Model model, Integer order_id,HttpServletRequest request) throws Exception { Map json = new HashMap(); User user = (User) model.asMap().get("user"); ShareOrderInfo order = orderInfoMapper.selectByPrimaryKey(order_id); //生成一笔预付订单流水 String trad_no = "PC_WECHAT" + OrderNoUtil.leadsNo();//订单流水号 ShareUserTrad trad = new ShareUserTrad(); trad.setResourceTradId(-1); trad.setUserId(user.getId()); trad.setCreatedBy(user.getId()); trad.setLastUpdBy(user.getId()); trad.setOnlineOfflineFlag("0");//线上 trad.setOrderNo(order.getOrderNo()); trad.setUserTradAmount(order.getToBePaid()); trad.setTradMethod("4");//支付宝 trad.setPayReceiveFlag("2");//支出 trad.setSuccessFlag("0");//交易进行中 trad.setTradType("1");//订单支付 trad.setTradNo(trad_no); trad.setModifyNum(0); shareUserTradMapper.insertSelective(trad); //随机字符串 String nonce_str = PayUtil.getRandomString(32); String UTF8 = "UTF-8"; Map<String,String> map = new HashMap<String,String>(); map.put("body","订单["+order.getOrderNo()+"]支付"); map.put("trade_type","NATIVE"); map.put("mch_id",Config.wechat_mch_id); map.put("sign_type","MD5"); map.put("nonce_str",nonce_str); map.put("fee_type","CNY"); map.put("device_info","WEB"); map.put("out_trade_no",trad_no); map.put("total_fee",order.getToBePaid().multiply(new BigDecimal(100)).toBigInteger().toString()); // map.put("total_fee","1");//测试 map.put("appid",Config.wechat_app_id); map.put("notify_url",Config.wechat_notify_url); map.put("spbill_create_ip",PayUtil.getIp(request)); String sign = PayUtil.getWechatSign(map); String reqBody = "<xml>" + "<body>"+map.get("body")+"</body>" + "<trade_type>"+map.get("trade_type")+"</trade_type>" + "<mch_id>"+map.get("mch_id")+"</mch_id>" + "<sign_type>"+map.get("sign_type")+"</sign_type>" + "<nonce_str>"+map.get("nonce_str")+"</nonce_str>" + "<detail />"+ "<fee_type>"+map.get("fee_type")+"</fee_type>" + "<device_info>"+map.get("device_info")+"</device_info>" + "<out_trade_no>"+map.get("out_trade_no")+"</out_trade_no>" + "<total_fee>"+map.get("total_fee")+"</total_fee>" + "<appid>"+map.get("appid")+"</appid>" + "<notify_url>"+map.get("notify_url")+"</notify_url>" + "<sign>"+sign+"</sign>" + "<spbill_create_ip>"+map.get("spbill_create_ip")+"</spbill_create_ip>" + "</xml>"; URL httpUrl = new URL(Config.wechat_url); HttpURLConnection httpURLConnection = (HttpURLConnection) httpUrl.openConnection(); httpURLConnection.setRequestProperty("Host", "api.mch.weixin.qq.com"); httpURLConnection.setDoOutput(true); httpURLConnection.setRequestMethod("POST"); httpURLConnection.setConnectTimeout(10*1000); httpURLConnection.setReadTimeout(10*1000); httpURLConnection.connect(); OutputStream outputStream = httpURLConnection.getOutputStream(); outputStream.write(reqBody.getBytes(UTF8)); //获取内容 InputStream inputStream = httpURLConnection.getInputStream(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, UTF8)); final StringBuffer stringBuffer = new StringBuffer(); String line = null; while ((line = bufferedReader.readLine()) != null) { stringBuffer.append(line); } String resp = stringBuffer.toString(); if (stringBuffer!=null) { try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } if (inputStream!=null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } if (outputStream!=null) { try { outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } Map<String, String> respData = PayUtil.xmlToMap(resp); String return_code = ""; if (respData.containsKey("return_code")) { return_code = respData.get("return_code"); } if("SUCCESS".equals(return_code)){ if (respData.containsKey("sign") ) { String respSign = respData.get("sign"); if(respData.get("sign").equals(PayUtil.getWechatSign(respData))){ json.put("code_url",respData.get("code_url")); } } } System.out.println(resp); return json; }
respData.get("code_url")
这个就是我们要的二维码内容。
PayUtil:
import org.w3c.dom.Node; import org.w3c.dom.NodeList; import javax.servlet.http.HttpServletRequest; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.security.MessageDigest; import java.util.*; public class PayUtil { /** * MD5加密 * @param data * @return * @throws Exception */ public static String MD5(String data) throws Exception { java.security.MessageDigest md = MessageDigest.getInstance("MD5"); byte[] array = md.digest(data.getBytes("UTF-8")); StringBuilder sb = new StringBuilder(); for (byte item : array) { sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3)); } return sb.toString().toUpperCase(); } /** * XML转MAP * @param strXML * @return * @throws Exception */ public static Map<String, String> xmlToMap(String strXML) throws Exception { try { Map<String, String> data = new HashMap<String, String>(); DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8")); org.w3c.dom.Document doc = documentBuilder.parse(stream); doc.getDocumentElement().normalize(); NodeList nodeList = doc.getDocumentElement().getChildNodes(); for (int idx = 0; idx < nodeList.getLength(); ++idx) { Node node = nodeList.item(idx); if (node.getNodeType() == Node.ELEMENT_NODE) { org.w3c.dom.Element element = (org.w3c.dom.Element) node; data.put(element.getNodeName(), element.getTextContent()); } } try { stream.close(); } catch (Exception ex) { ex.printStackTrace(); } return data; } catch (Exception ex) { ex.printStackTrace(); return null; } } /** * 获取随机字符串 * @param length * @return */ public static String getRandomString(int length) { //length表示生成字符串的长度 String base = "abcdefghijklmnopqrstuvwxyz0123456789"; Random random = new Random(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < length; i++) { int number = random.nextInt(base.length()); sb.append(base.charAt(number)); } return sb.toString(); } /** * 获取IP地址 * @param request * @return */ public static String getIp(HttpServletRequest request){ String ip = request.getHeader("x-forwarded-for"); if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("WL-Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_CLIENT_IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_X_FORWARDED_FOR"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } return ip; } /** * 获取微信支付签名 * @param map * @return * @throws Exception */ public static String getWechatSign(Map<String,String> map) throws Exception{ Set<String> keySet = map.keySet(); String[] keyArray = keySet.toArray(new String[keySet.size()]); Arrays.sort(keyArray); StringBuilder sb = new StringBuilder(); for (String k : keyArray) { if (k.equals("sign")) { continue; } if (map.get(k).trim().length() > 0) {// 参数值为空,则不参与签名 sb.append(k).append("=").append(map.get(k).trim()).append("&"); } } sb.append("key=").append(Config.wechat_key); return PayUtil.MD5(sb.toString()).toUpperCase(); } /** * * Map转xml数据 */ public static String mapToXML(Map<String,String> param){ StringBuffer sb = new StringBuffer(); sb.append("<xml>"); for (Map.Entry<String,String> entry : param.entrySet()) { sb.append("<"+ entry.getKey() +">"); sb.append(entry.getValue()); sb.append("</"+ entry.getKey() +">"); } sb.append("</xml>"); return sb.toString(); } }
2、前台根据code_url生成支付二维码
这里我使用了第三方js控件qrcode来生成二维码。
function toWechatPay(){ var data = "order_id=" + ${id}; $.ajax({ url: rootPath + '/pay/doWechatPay', type: "post", data: data, processData: true, success: function (result) { var json = eval('('+result+')'); $("#wechatQrcode").qrcode({ render: "table", //table方式 width: 200, //宽度 height:200, //高度 text: json.code_url //任意内容 }); $(document).ready(function () { setInterval("ajaxstatus()", 3000); }); }, error: function (XMLHttpRequest, error, errorThrown) { layer.msg("支付失败,原因:保存预支付交易流水失败"); } }); }
因为二维码为静态的,所以设置一个三秒的定时任务查询订单的状态,来改变页面。
扫描二维码关注公众号,回复:
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function ajaxstatus() { var data = "order_id=" + ${id}; $.ajax({ url: rootPath + '/pay/getPayStatus', type: "GET", dataType:"json", data: data, success: function (data) { if (data.status == "3") { //订单状态为3表示支付成功 layer.msg("支付成功,请刷新页面~",{shift: -1,time:2000},function(){ var index = parent.layer.getFrameIndex(window.name); parent.layer.close(index); }); } }, error: function () { layer.msg("请求订单状态出错"); } }); }
3、异步通知
/** * 微信支付异步通知 * @param request * @param response * @throws Exception */ @RequestMapping(value = "/wechatPayNo", method = RequestMethod.POST) @ResponseBody public void wechatPayNotify(HttpServletRequest request,HttpServletResponse response) throws Exception { ServletInputStream instream = request.getInputStream(); StringBuffer sb = new StringBuffer(); int len = -1; byte[] buffer = new byte[1024]; while((len = instream.read(buffer)) != -1){ sb.append(new String(buffer,0,len)); } instream.close(); Map<String,String> requestMap = PayUtil.xmlToMap(sb.toString());//接受微信的通知参数 String return_code = ""; String returnXml = ""; // BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); if (requestMap.containsKey("return_code")) { return_code = requestMap.get("return_code"); }else{ returnXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[return_code不存在]]></return_msg>" + "</xml> "; // out.write(returnXml.getBytes()); } if("SUCCESS".equals(return_code)){ if (requestMap.containsKey("sign") ) { String respSign = requestMap.get("sign"); if(respSign.equals(PayUtil.getWechatSign(requestMap))){ DealUserTradModel dealUserTradModel = new DealUserTradModel(); dealUserTradModel.setOut_trad_no(requestMap.get("transaction_id")); dealUserTradModel.setTrad_no(requestMap.get("out_trade_no")); dealUserTradModel.setCompany_amount(new BigDecimal(requestMap.get("total_fee")).divide(new BigDecimal("100")));//微信以分为单位,除以100…… dealUserTradModel.setPay_amount(new BigDecimal(requestMap.get("total_fee")).divide(new BigDecimal("100"))); dealUserTradModel.setUser_account(requestMap.get("openid")); dealUserTradModel.setUser_account_name(requestMap.get("openid")); payService.dealTrad(dealUserTradModel); // returnXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>" // + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> "; // out.write(returnXml.getBytes()); String msg = "success"; response.setContentType("text/xml"); response.getWriter().println(msg); }else{ returnXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[sign不正确]]></return_msg>" + "</xml> "; // out.write(returnXml.getBytes()); } }else{ returnXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[sign不正确]]></return_msg>" + "</xml> "; // out.write(returnXml.getBytes()); } }else{ returnXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[return_code不正确]]></return_msg>" + "</xml> "; // out.write(returnXml.getBytes()); } // out.flush(); // out.close(); }
校验参数,并修改数据库的订单状态,同时返回success,否则微信会重复通知。
String msg = "success"; response.setContentType("text/xml"); response.getWriter().println(msg);